package com.atguigu.gulimall.product.service.impl;

import com.baomidou.mybatisplus.core.mapper.BaseMapper;
import lombok.extern.slf4j.Slf4j;
import org.springframework.stereotype.Service;

import java.util.*;
import java.util.stream.Collector;
import java.util.stream.Collectors;

import com.baomidou.mybatisplus.core.conditions.query.QueryWrapper;
import com.baomidou.mybatisplus.core.metadata.IPage;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.atguigu.common.utils.PageUtils;
import com.atguigu.common.utils.Query;

import com.atguigu.gulimall.product.dao.CategoryDao;
import com.atguigu.gulimall.product.entity.CategoryEntity;
import com.atguigu.gulimall.product.service.CategoryService;
import org.springframework.util.CollectionUtils;


@Service("categoryService")
@Slf4j
public class CategoryServiceImpl extends ServiceImpl<CategoryDao, CategoryEntity> implements CategoryService {


    @Override
    public PageUtils queryPage(Map<String, Object> params) {
        IPage<CategoryEntity> page = this.page(
                new Query<CategoryEntity>().getPage(params),
                new QueryWrapper<CategoryEntity>()
        );

        return new PageUtils(page);
    }

    @Override
    public List<CategoryEntity> getCategorytree() {
        List<CategoryEntity> list = baseMapper.selectList(null);

        List<CategoryEntity> categoryEntityList = list.stream()
                .filter(categoryEntity -> categoryEntity.getParentCid() == 0)
                .sorted((menu1,menu2)->(menu1.getSort()==null?0:menu1.getSort())-(menu2.getSort()==null?0:menu2.getSort()))
                .map(categoryEntity -> {categoryEntity.setChildren(getChildrens(categoryEntity,list));
//                    log.info("=============getCatId = "+categoryEntity.getCatId());
                                        return categoryEntity;})
                .collect(Collectors.toList());

        return categoryEntityList;
    }

    @Override
    public void removeMenuByIds(List<Long> longs) {
        //TODO 检查别的地方没有应用再删除
        baseMapper.deleteBatchIds(longs);
    }

    @Override
    public Long[] findCatelogPath(Long attrGroupId) {

        List<Long> paths = new ArrayList<Long>();

        paths = findpaths(attrGroupId,paths);

        Collections.reverse(paths);

        return paths.toArray(new Long[paths.size()]);
    }

    private List<Long> findpaths(Long attrGroupId, List<Long> paths) {

        paths.add(attrGroupId);

        CategoryEntity byId = this.getById(attrGroupId);

        if(byId.getParentCid()!=0){

            findpaths(byId.getParentCid(),paths);

        }


        return paths;
    }

    //递归查找所有菜单的子菜单
    private List<CategoryEntity> getChildrens(CategoryEntity root,List<CategoryEntity> all){

        List<CategoryEntity> children = all.stream().filter(categoryEntity -> {
            return categoryEntity.getParentCid() == root.getCatId();
        }).map(categoryEntity -> {
            //1、找到子菜单
           categoryEntity.setChildren(getChildrens(categoryEntity,all));
            return categoryEntity;
        }).sorted((menu1,menu2)->{
            //2、菜单的排序
            return (menu1.getSort()==null?0:menu1.getSort()) - (menu2.getSort()==null?0:menu2.getSort());
        }).collect(Collectors.toList());

        return children;
    }

}